HD Domain of SAMHD1 Influences Vpx-Induced Degradation at a Post-Interaction Step.
HD Domain of SAMHD1 Influences Vpx-Induced Degradation at a Post-Interaction Step.
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SAMHD1 的 HD 域影响交互后步骤中 Vpx 诱导的降解。
DOI:
10.1016/j.bbrc.2016.01.080
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发表时间:
2016-02
期刊:
影响因子:
--
通讯作者:
Du Juan
中科院分区:
文献类型:
--
作者:
Kang Jian;Hou Jingwei;Zhao Ke;Yu Xiao-Fang;Du Juan
Primate SAMHD1 proteins are potent inhibitors of viruses, including retroviruses such as HIV-1, HIV-2, and SIV. Vpx, a distinctive viral protein expressed by HIV-2 and some SIVs, induces SAMHD1 degradation by forming a Vpx-DCAF1-based ubiquitin ligase complex. Either the N- or the C-terminus of SAMHD1 is critical for Vpx-induced degradation, depending on the types of SAMHD1 and Vpx proteins. However, it was not fully understood whether other regions of SAMHD1 also contribute to its depletion by Vpx. In the present study, we report that SAMHD1 from chicken (SAMHD1GG) was not degraded by SIVmac Vpx, in contrast with results for human SAMHD1 (SAMHD1HS). Results regarding to SAMHD1HSand SAMHD1GGfusion proteins supported previous findings that the C-terminus of SAMHD1HSis essential for Vpx-induced degradation. Internal domain substitution, however, revealed that the HD domain also contributes to Vpx-mediated SAMHD1 degradation. Interestingly, the HD domain influenced Vpx-mediated SAMHD1 degradation without affecting Vpx-SAMHD1 interaction. Therefore, our findings revealed that factors in addition to Vpx-SAMHD1 binding influence the efficiency of Vpx-mediated SAMHD1 degradation.
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